Year	Percent
1990	14.417
1991	14.964
1992	16.23
1993	16.358
1994	21.391
1995	21.552
1996	22.504
1997	22.174
1998	23.302
1999	23.871
2000	23.471
2001	22.431
2002	21.185
2003	20.167
2004	19.1
2005	17.775
2006	16.523
2007	15.343
2008	14.233
2009	13.191
2010	12.214
2011	11.3
2012	9.6
2013	9.2
2014	12.3
2015	13.98
2016	15.4
2017	14.741
2018	14.081
2019	13.422
2020	12.762
2021	12.103
2022	11.443
2023	10.784
2024	10.125
2025	9.465
2026	8.806
2027	8.146
2028	7.487
2029	6.827
2030	6.168